<div>
  <span style="display: inline-block; width: 60px; vertical-align: top;">预设数据</span>
  <span style="display: inline-block; width: calc(100% - 80px);">
    <textarea style="width: 100%;" rows="5">{{=btoa(encodeURIComponent(JSON.stringify({ blanks: it.blanks, images: it.images, blankGroups: it.blankGroups })))}}</textarea>
  </span>
</div>